I can confirm that DirectX version is behaving correctly regarding the specular lighting effect, as in the attached image. However, you can clearly see from the image that DirectX version has it's own bigger problems which makes it unusable for me: it is not honouring the Back-face normal flip option in the PolygonAttributes constructor (see the very dark front facing faces). Is this a bug in j3d or simply directx layer doesn't know about back-face normal flip ?
I'll make a simple test case for the opengl problem and send it to you. Cheers, Florin -----Urspr�ngliche Nachricht----- Von: Kelvin Chung [mailto:[EMAIL PROTECTED] Gesendet: Dienstag, 25. M�rz 2003 19:18 An: Florin Herinean Cc: Discussion list for Java 3D API Betreff: Re: [JAVA3D] AW: [JAVA3D] Problem with Specular Color Florin Herinean wrote: >Ooops! > >Kelvin tell that bug 4722648 - Non-uniform scale causes lighting errors - is >fixed in J3D v1.3.1 beta1 > >Actually is not fixed. See the attached picture obtained with j3d v1.3.1 >beta ogl. The blue areas should all have the same color, since the surfaces >are all parallel and the light is directional, but actually you can see 3 >different colors. A very small amount of non-uniform scale was applied to >every brick to create a small distance between them (a seam). > > > This is fixed based on the test case we have. Note that there is no such problem in Direct3D version of Java3D which always normalized normal. To confirm your finding, please try your applications on Direct3D version of Java3D, if you got the same rendering image and highlight. This is not the same problem and may cause by specular lighting effect for local viewer. Make sure positive non-uniform scale is used. - Kelvin -------------- Java 3D Team Sun Microsystems Inc. >-----Urspr�ngliche Nachricht----- >Von: Florin Herinean >Gesendet: Mittwoch, 19. M�rz 2003 09:07 >An: 'Discussion list for Java 3D API' >Betreff: AW: [JAVA3D] Problem with Specular Color > > >Yes, that's the bug. So version 1.3.1 have it fixed. Lot's of nice fixes in >1.3.1 ! When will be a fcs release ? > >I was scaling up, the actual geometries were bigger than the original size >which was always normalized, size 1 in all directions. > >I've fixed my problem by using the workaround specified in the first >paragraph: "Scaling the geometry data explicitly and recomputing the normals >without using a non-uniform Transform3D will always work, but is expensive." > >Actually, in my case the "is expensive" proved not to be true, there was >absolutely no difference in loading time, memory usage or rendering time. > >Also, in the bug report there is a small error: "The bug only presents >itself when the scale is changed dynamically. If the Transform3D is >initially created with a non-uniform scale, then the lighting is correct >until Java 3D notices that the scale has become uniform again." That's not >true. In my app I was creating the transform3d directly with a non-uniform >scale and never touching it anymore, but the lighting was incorrect. > >Cheers, > >Florin > >-----Urspr�ngliche Nachricht----- >Von: Kelvin Chung [mailto:[EMAIL PROTECTED] >Gesendet: Dienstag, 18. M�rz 2003 22:14 >An: [EMAIL PROTECTED] >Betreff: Re: [JAVA3D] AW: [JAVA3D] Problem with Specular Color > > >Monica Sleumer wrote: > > > >>I agree that the non-uniform scaling probably has a lot to do with it, >>because I noticed that the effect got worse the more I scaled the >>geometry. For instance, the cylinders that still looked like cylinders >>had no problem, but those that were scaled down into disks a few pixels >>thick had serious problems. >>Unfortunately, I have to scale everything to the proper size in the >>application I'm writing. At least setting the specular color to black >>and the shininess to 1 removes the specular color artifact for now. >> >>Florin, did you scale your shapes up or down? That is, did you make them >>appear bigger or smaller than the original geometry size? In this >>application the shapes are always being scaled down. The original >>cylinder shape is much larger and longer in proportion than any of the >>cylinders in this application. I wonder whether scaling a shape down >>makes the specular color much brighter while scaling a shape up makes >>the colors much darker... >> >>Anyways, maybe I'll have fewer problems if I start with a VRML shape >>file that is closer to the eventual size of the shape that will be >>displayed, so that the scaling is less extreme. I'll try that next. >> >>Monica >> >> > >In case you're using J3D v1.3 release, there is a bug >4722648 - Non-uniform scale causes lighting errors > >which is fixed in J3D v1.3.1 beta1. > >- Kelvin >------------ >Java 3D Team >Sun Microsystems Inc. > >=========================================================================== >To unsubscribe, send email to [EMAIL PROTECTED] and include in the body >of the message "signoff JAVA3D-INTEREST". For general help, send email to >[EMAIL PROTECTED] and include in the body of the message "help". > > > > > ------------------------------------------------------------------------ >
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